JPS60241094A - Muffler for grand piano - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a muffler device for a grand piano that effectively reduces the sound volume of the performance and enables soft-pitched performance.

[Conventional technology]

Conventionally, in grand pianos, the keys and action mechanism are slid laterally along with the keyboard fluid by pedal operation, reducing the number of strings struck by the hammer.
For example, in the case of high-pitched strings, instead of hitting three strings with one hammer, you hit two strings to reduce the sound volume.
I try to play in a soft tone. However, moving the key and action mechanism requires a corresponding amount of movement space, and also requires a pedal and pedal lever mechanism, resulting in a complicated structure and an increased number of parts.

Therefore, a piano was proposed in which, like an upright piano, a buffer member was selectively interposed between the strings and the nozzle to weaken the impact force of the noma.
No. 94).

[Problem that the invention seeks to solve]

However, due to the structure of such pianos, the shock absorbing member must be placed in front of the string striking position (on the player's side), and because it occupies a large space, the shock absorber is hidden when adjusting the action. , it gets in the way of your work. Also,
Since the shock absorbing member must be placed horizontally and slid back and forth, the shock absorbing member itself must have a certain degree of rigidity.
The weak sound effect is reduced. Further, since the buffer member is arranged horizontally, even if it has some rigidity, it is likely to deform over time. Furthermore, since the position is changed by moving horizontally, the drive mechanism is complicated, and there are many disadvantages, such as the inconvenience of not having a function to hold or confirm when switching.

[Failure to solve the problem]

The muffler device for a grand piano according to the present invention has been made to solve the above-mentioned drawbacks, and has one end of a cushioning member attached to a muffler rod that is rotatably disposed below the strings and extends in a direction transverse to the strings. Usually, the buffer member is hung down by fixing the muffler rod, and the buffer member is interposed between the strings and the hammer by rotating the muffler rod by the operating means, and also reduces noise during the switching operation. It is also something that makes you emanate.

[Effect]

In this invention, since the buffer member is normally hung down, there is little change over time, and it has excellent shape stability.
There is still not much demand for rigidity.

Furthermore, the switching can be confirmed by emitting a sound during the switching operation.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a side sectional view of an action mechanism section of a grand piano equipped with a muffler device according to the present invention.

FIG. 2 is a perspective view of the muffler device, and FIG. 3 is a side view of the sounding mechanism. In FIG. 1, reference numeral 1 denotes a shelf board, on the top of which a keyboard reed 2 is disposed, and furthermore, keys 3 are disposed on the shelf board.

The keyboard reed 2 has a front reed 2A, a submerged 2B, and a rear reed 2C.

It is made up of $20 etc. in the keyboard liquid that connects these, and the front 2
For the person, there is a through-val key pin 4 that prevents the rotation of the key 3 in the left and right directions, and for the liquid 2B, there is a lance key pin 5 that supports the middle part of the key 3 so that it can rotate freely in the vertical direction. It is planted.

=4- A conventionally well-known action mechanism 6 is located above the rear end of the key 3.
are arranged corresponding to the strings T. The action mechanism 6 has one end rotatably supported on the support rail 8 via a flange 9, and has a wippen 11. which is pushed up and rotated by the capstan 10 when the key 3 is pressed. A jack 12 rotatably supported on the free end of the wippen 11.
A rotation lever 14, -i is rotatably disposed above the wippen 11 via a flange 13, and is rotatably supported on a shank rail 15 via a flange 16. A hammer shank 20. is constructed by fixing a hammer felt 18 through a hammer shank 20. which is normally placed on the revetation lever 14 through a hammer roller 19. The jack 12 and the rotation lever 14 are made up of a rotation lever spring 21 and the like that provide a return behavior. The jack 12 is raised integrally with the repetition lever 14 to lower the number roller 1.
Push up 9 and press the regulation button 2 on the way.
2 and rotated clockwise, the above-mentioned
It is configured to temporarily escape from the lower part of the heat roller 19. The hammer shank 20 is rotated upward by the pushing up action of the hammer roller 19 by the jack 12, so that the hammer felt 18 hits the string T by hitting 17 and produces a sound.

Note that the support rail 8 and the shank rail 15
is fixed to a bracket 24 erected on the keyboard reed 2. Further, both ends of the string are attached to a tuning pin 26 and a frame pin (not shown) on a frame 25 with seven strings, and the string is stretched almost horizontally with a predetermined tension.

A well-known damper mechanism 30 is disposed behind the key 3 and operates in conjunction with the key depression operation of the key 3. This damper mechanism 30 normally prevents the string T from freely vibrating, and includes a damper lever 31 and a damper wire 32. It is composed of a damper 33 and the like, and when the damper lever 31 is pushed up by the rear end of the key 3 in response to a key press operation, the damper wire 32 is raised to separate the damper 33 from the string γ.

Now, the muffler installation ft.40 that characterizes this invention is as follows:
A muffler rod 41 (
(see Figures 2 and 3). This muffler rod 41 is located below the string 7 and above the hammer felt 1.
The bracket mounting plate 42 is rotatably supported by a bracket mounting plate 42 and a bracket 43, respectively.
4 is fixed with screws. A buffer member 45 made of a flexible material such as leather, felt, or non-woven fabric and having a certain degree of rigidity is fixed to the muffler rod 41 at its upper end and hangs down therefrom. This buffer member 45 has a large number of notches 4 to prevent it from being affected by the striking of adjacent keys when playing soft notes.
6 is formed within a range that does not reduce the overall rigidity.

Furthermore, a sounding mechanism 4T is disposed at one end of the muffler rod 41. This sounding mechanism 4T is the muffler rod 4
1 and a connecting member 48 and a magnet 49 that are fitted and fixed to the muffler rod 41, and as the muffler rod 41 rotates, the magnet 49 comes into contact with and attracts the upper and lower surfaces of the bracket 43 as shown by the chain lines in FIG. The device is configured to generate a "click" sound every time the device clicks. Moreover, the magnet 49
is attracted to the bracket 43 to hold the muffler rod 41 in its rotational position, thereby switching the buffer member 45 between the states shown by the solid line and the chain line in FIG. 1. Then, this switching operation is performed on the shelf board 1.
This is performed by an operating lever 51 disposed via a bracket 50 at an appropriate location on the front end of the lower surface. The operating lever 51 and the connecting member 48 are connected by a wire 52, and the wire 52 is urged toward the connecting member 48 by a spring 53. Therefore, the connecting member 48 is normally held in a position where the magnet 49 contacts and attracts the upper surface of the bracket 43, and in this state, the buffer member 45 maintains the hanging state shown by the solid line in FIG. 1, allowing normal performance. I have to. To switch from the normal performance state to the soft performance state, the operating lever 51 can be pulled toward the user.

Then, the wire 52 is pulled against the spring 53 and the connecting member 48 is rotated clockwise in FIG. and the hammerfell eye 8. Therefore, when the key 3 is operated in this state and the action mechanism 6 is operated in conjunction with this to rotate and fly the hammer shank 20 upward, the hammer felt 18 hits the string T via the buffer member 45. Therefore, the striking force is weakened and the sound volume is reduced. Note that the operating lever 51 is locked in the pulled position.

According to the muffler device 40 having such a configuration, switching between normal performance and soft tone performance can be easily performed using the operating lever 51.

Further, the operating lever 51 is connected to the connecting member 4 by a wire 52.
Since it is operatively connected to B, its mounting position can be freely selected. Further, since the buffer member 45 is normally located behind the hammer, it does not interfere with the adjustment and assembly work of the action mechanism 6, and does not reduce work efficiency. Furthermore, since the sounding mechanism 40 emits a sound when the operating lever 51 performs a switching operation, the switching can be reliably confirmed.

Furthermore, since the sound generating mechanism 4T has a function of maintaining the switching state, it has the advantage that there is no chance of accidentally switching from the normal performance state to the low tone performance state or vice versa during performance. .

In addition, in the above embodiment, the magnet 49 is used as the sound generating mechanism 4T.
However, this invention is not limited to this, and various modifications are possible.In short, any mechanism that emits a sound in conjunction with the switching operation may be used, and its position is not limited to the muffler rod 41, but may also be placed on the operating lever. It may be provided in 51 parts.

Further, in the above embodiment, the muffler rod 41 extends commonly to all strings I, but if necessary, it may be divided into sections or may be omitted in the treble range, etc. Therefore, it is preferable to provide a flange portion on the muffler rod 41 along the longitudinal direction by an appropriate method such as integrally extruding it with the rod-shaped portion or fixing it as a separate item. Furthermore, forming a large number of cuts 46 in the buffer member 45 can be omitted by appropriately selecting the material, thickness, etc. of the buffer member 45.

Further, in the above embodiment, an operating lever 51 and a wire 52 are used as operating means, and one end of the wire 52 is connected to the connecting member 48. However, a knee lever or a pedal may be used instead of the operating lever 51, or the connecting member 4B may be used as a knee lever or a pedal. It may be omitted and connected directly to the muffler rod 41. Furthermore, although the wire 52 is used to transmit the input operation of the operating means, it is also possible to use a rod, a link device, or any other appropriate means. Various modifications are possible, such as connecting to a rack and moving this rack up and down with a wire 52, fixing a pinion that meshes with the rack to the muffler rod 41, or interposing a link.

〔Effect of the invention〕

As explained above, according to the muffler device for a grand piano according to the present invention, it is possible to reliably switch between normal performance and soft-tone performance with a simple structure, and the buffer member does not hang down in the non-operating state. Since it does not deform over time, it has excellent shape stability, switching can be confirmed, and since the position is changed by rotation, the movement mechanism is simplified, and it can be manufactured and provided at low cost. That effect is a dog.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of an action mechanism equipped with a muffler device according to the present invention, FIG. 2 is a perspective view of the muffler device, and FIG. 3 is a side view of the sounding mechanism. 3...Key, 6...Action mechanism, T...
String, 18φ・φ・Hammer felt, 40・・・Muffler fitting, 41・・φ・Muffler rod, 45・・Buffer member, 46・・Q・Notch, 4T・・・
... Sound generation mechanism, 51 ... Operation lever, 52 ...
wire. Patent applicant: Nippon Musical Instruments Manufacturing Co., Ltd. Representative: Masaki Yamakawa (and 2 others) -13-69
4-12-

Claims (1)

[Scope of Claims] (1) A muffler rod that is rotatably disposed below the string and extends in a direction transverse to the string, and a buffer member that has one end fixed to the muffler rod and hangs down in an inactive state. A muffler device for a grand piano, comprising an operating means for rotating the muffler rod, and the operating means rotates the muffler rod so that the buffer member is interposed between the string and the hammer. . 3) The muffler device for a grand piano according to claim 1, wherein the muffler rod is arranged behind the hammer and below the strings. (3) Claim 1 or 2, characterized in that the operating means is composed of an operating lever and a wire.
The grand piano muffler device described in Section 1. (4) A muffler rod that is rotatably disposed below the string and extends in a direction across the string, and a buffer member that has one end fixed to the muffler rod and hangs down in an inactive state. The muffler rod is provided with an operating means for rotating the muffler rod, and a sounding mechanism that emits a sound when the operating means is operated, and the operating means rotates the muffler rod so that the buffer member is interposed between the string and the hammer. A muffler device for a grand piano, characterized in that the muffler device is configured to